TY - BOOK ID - 69026725 TI - IEEE No 305-1969 : IEEE Guide for Protective Relay Applications of Audio Tones over Telephone Channels PY - 1969 SN - 1504402820 PB - New York : IEEE, DB - UniCat KW - Telephone. UR - https://www.unicat.be/uniCat?func=search&query=sysid:69026725 AB - ER -